quest · builder's guild
Cardboard tubes. Tape. One wall. Gravity does the rest. This is real engineering — every joint has to line up.
A grown-up works with you and owns a few steps of this quest.
🧑 The grown-up owns: Does all cutting, approves the wall/tape, and keeps marbles away from little kids and pets.
what you'll need
safety · Marbles are a choking hazard: no little kids or pets in the room, and every marble goes back in a closed container the second you're done. All cutting is done by a grown-up — no scissors, blades, or box cutters in this build. Never stand on furniture to reach higher; build only as high as your own arms.
🧑 grown-up does
These steps belong to the grown-up. Grab a grown-up.
1. Approve the wall and the tape
Pick a surface that painter's tape won't damage — a fridge side, a closet door, or a big cardboard box.
2. Do all the cutting
Slice the tubes in half lengthwise into open troughs. Trim the ends square. Hand back finished pieces so no blade goes near the Sk8er.
3. Own the marbles
Keep the marbles until build time, keep small children and pets out of the room, and collect every marble at the end.
Read the safety badge and the grown-up steps together before you start.